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S. A.` BRIGGS.

Con and Cob Mill.

No. 29,033. Patented July 3, 1860. y

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UNITED STATES PATN FIC STEPHEN A. BRIGGS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO` HIMSELF AND C. G. CROWELL, OF SAHE PLACE.

VCORN AND COB MILL.

Specification of Letters Patent No. 29,033, dated July 3, 1860.

I To all whom it may concern:

Be it known that I, STEPHEN A. BRIGGS, of the city of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Corn and Cob Mills; and I do hereby declare that the following is a full, clear, and exact description of the construct-ion and operation of the same, reference being had t'o the annexed drawings, making a part of this specification, in which- Figure l represents a vertical longitudinal section 0f a common corn and cob mill, with the improvement applied-the rotary feeder and Crusher thereof, being in perspective; and Figs. 2, and 3, sectional plan views of the grinding faces of the same, like letters, when on the different figures, indicating the same parts.

The nature of this improvement consists in the application of spiral flanges, or propelling vanes, around the cylinder of the rotary feeder and Crusher between horizontal arms arranged in two vertical rows on the same, as hereinafter described, for the purpose of giving it a positive feeding capacity; and also in the application of stops in the grooves, or between the raised grinding surfaces, of the faces of the disks, as hereinafter described, whereby their grinding surfaces and functions are increased without increasing their diameters, and the usual heating of the disks and grain, in grinding, is prevented.

In the drawings, A, represents the rotating feeder and Crusher; B, the grinding shell; C the grinding nut within the shell; D, the shaft which carries the nut (C) and also the rotating crusher and feeder (A), E, the hopper; and F, the steady for the upper end of the shaft (D).

The rotating crusher and feeder (A) is provided with two spiral flanges, or propelling vanes g, g, each of which extend, from the top to the bottom, around on opposite halves of the cylinder of the same, while the usual horizontal arms L-L are arranged in two vertical rows between the said two spirals (g,-(,)-as seen in Fig. l. These parts are cast, together, in one piece, and so as to be afterward slipped over and keyed or bolted securely, upon the shaft (D), with its lower end in Contact with the top of the nut (C), as seen in the same iigure. The spirals (g, g) operate by pressing The shell (B) and nut `(C) are each cast t in one piece, with a projecting, curved oriat, grinding disk (B-C) in the usual manner. The faces of these grinding disks may be formed with either curved or straight tangentially inclined grooves j-j, n

in the usual manner; but instead of stopping the said grooves by a stop curved in a line with and at the periphery of the disks as heretofore, I stop them, each, obliquely thereto, or so as to produce the serrations or recesses i at the peripheries of the said disks and also the angular mouths or spaces c-/c within the said grooves, and in the same manner I also stop the inner ends of t-he said grooves so as to produce the open, angular mouths or spaces Z-Z, at some little distance from the said inner ends-as seen in Figs. 2 and 3. The grooves (j-j) thus stopped, I usually make flat at their bottoms; and the grinding surfaces, consisting of the dividing ridges m-m, between the grooves i-j) and the stops n n, are made triangular in their transverse section, the whole producing together on each disk (B and C), in this instance, two distinct series of angular mouths (7c-lc) and (Z-Z) bounded and connected by ridges which are angular or bevel edged on their upper sides, as seen in Figs. 2 and 3.

The grooves, ridges, and stops being arranged together on each disk, precisely in like manner or direction, it follows that when the shell (B) is placed around over the nut (C), as seen in Fig. 1, the said ridges and grooves on the disk of the shell (B) will obliquely cross those on the disk of the nut (C), as indicated by the red lines in Fig. 2; and thus-the nut rotating in the direction of the arrowthey will produce a shearing cut as well as a grinding effect upon the article operated on while it is sufficiently retarded for the purpose by the stops (n n) which form, in the grooves the angular grinding mouths c-:

and Z-Z, after which the ground product passes freely over or between the stops at the peripheries of the disks and falls directly into the chamber o, below, from whence it is pushed by the Scrapers p-p, to the spout g, in the usual manner.

By this arrangement of the stops in the grooves (j-j) of the disks (BL-(Y) the grain flour, Sac., cannot become packed and heated around the outer peripheries of the said disks, as heretofore, nor yet against the stops which are near their inner peripheries; and besides, from the general angular form of the ridges with that of the said stops (a-f/L), the grain, cobs, &c., are crushed and at the same time left free in the grooves to pass to the angular mouths (lc-wk, and Z-Z) by the rotary motion of the nut (C), and therefore Without becoming heated even Whilst in the said grooves. The result is, that the corn, cobs, &c., are ground in a much more free, rapid and perfect manner than heretofore.

I do not Wish to limit the number of stops (n) to tWo only, nor these to the particular angle at Which they are placed, in the drawing, as it is manifest that they should be increased in number in each groove, to suit any increase in the diameters of the disks, and their angles of inclination to the ridges, also varied to suit the particular kinds or qualities of the articles intended to be ground in the mill-as some articles require an acute, Whilst other articles are better ground by an obtuse angle in the mouths 7c, and Z.

I am aware that oblique, serrated flanches have been applied to the shaft Which carries the conical nut, as in T. B. Comseys mill, patented May 31, 1859; and also that obstructing strips 7 have been placed across the grooves of a conical nut and shell, for the purpose of partially obstructing the passage of the broken corn and cobs through the same, as in A. Prosens mill, patented January ll, 1859; therefore, I do not claim, broadly, the application of the spiral propelling vanes to the cylinder (A) nor do I claim the application of obstructing strips or stops to the grooves of either a conical nut or shell; but,

Having thus fully described my improved mill and pointed out its (superior) utility, what I claim therein as new of my invention, and desire to secure by Letters Patent is l. The application of the spiral propellervanes (g, g,) around the cylinder of the rot-ary Crusher (A), When the same are arranged in relation to the arms (7L-7L) substantially as and for the purpose specified.

2. The application of the stops in combination with the grooves and ridges (mf-m) on the disks (B and C), substantially in the manner and for the purpose set forth and described.

STEPHEN A. BRIGGS.

l/Vitnesses:

BENJ. MORRISON, J. O. CROWELL. 

